<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>074-局部执行环境.html</title>
</head>
<body>
	
</body>
<script>
	var a = 1;
	function showName(){
		var b = 2;
		console.log("i am Chris");
	}
	showName();
	console.log("hello");
</script>
</html>